Respiratory disorders, also known as lung diseases, are conditions that affect the respiratory system, making it difficult to breathe. These disorders can be caused by infections, exposure to irritants, or underlying medical conditions. Common respiratory disorders include asthma, chronic obstructive pulmonary disease (COPD), pneumonia, and lung cancer. Symptoms can range from mild to severe and may include coughing, shortness of breath, wheezing, and chest pain. Treatment depends on the specific disorder and may involve medications, lifestyle changes, or surgery.